connection_aborted
(PHP 4, PHP 5, PHP 7, PHP 8)
connection_aborted — クライアントとの接続が切断されているかどうかを調べる
パラメータ
この関数にはパラメータはありません。
戻り値
クライアントとの接続が切断されている場合に 1、それ以外の場合に 0 を返します。
参考
- connection_status() - 接続ステータスのビットフィールドを返す
- ignore_user_abort() - クライアントの接続が切断された際にスクリプトの実行を終了するかどうかを設定する
- PHP における接続処理についての説明は 接続処理
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User Contributed Notes 2 notes
nathanb at php dot net ¶
11 years ago
A trick to detecting if a connection is closed without having to send data that will otherwise corrupt the stream of data (like a binary file) you can use a combination of chunking the data on HTTP/1.1 by sending a "0" ("zero") as a leading chunk size without anything else.
*NOTE* it's important to note that it's not a good idea to check the stream more then once every few seconds. By doing this you are potentially increasing the data sent to the user with no gain to the user.
A good reason to do it this way is if you are generating a report that takes a long time to run and takes a lot of server resources. This would allow the server to detect if a user canceled the download and do any cleanup without corrupting the file file being download.
Here is an example:
<?php
ignore_user_abort(true);
header('Transfer-Encoding:chunked');
ob_flush();
flush();
$start = microtime(true);
$i = 0;
// Use this function to echo anything to the browser.
function vPrint($data){
if(strlen($data))
echo dechex(strlen($data)), "\r\n", $data, "\r\n";
ob_flush();
flush();
}
// You MUST execute this function after you are done streaming information to the browser.
function endPacket(){
echo "0\r\n\r\n";
ob_flush();
flush();
}
do{
echo "0";
ob_flush();
flush();
if(connection_aborted()){
// This happens when connection is closed
file_put_contents('/tmp/test.tmp', sprintf("Conn Closed\nTime spent with connection open: %01.5f sec\nLoop itterations: %s\n\n", microtime(true) - $start, $i), FILE_APPEND);
endPacket();
exit;
}
usleep(50000);
vPrint("I get echo'ed every itteration (every .5 second)<br />\n");
}while($i++ < 200);
endPacket();
?>
Rupak Bajgain ¶
1 year ago
One trick i used uas to send values in comment to get long pooling with disconnect check
Like for json:
Send 0 and flush before connection aborted.
Eg. {"x":"000000
And after result is ready send ", and json after removing 1st {
So it looks like
{"x":"00000000000","y":"result","z":"result2"}